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Sounds like what happened when my car threw me the "engine malfunction - reduce engine output" messages due to EGR cooler leak. There's almost certainly something wrong with the car and it's very peculiar that it isn't giving you any messages or codes.
If you haven't changed the fuel filter within the past 2-3 years, do it first. Low fuel flow could easily be a problem here. Diesel filters tend to clog up more quickly than gas variants.
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